Aluminum vs Steel Radiator: Best Company & Compatibility with PEX, Open Installation Furnace

Hello, what radiators to buy aluminum or steel and from which company is best? Furnace with feeder open installation all done pex two distributors each on the floor

Cauldron for had? You used pex pipes so there will be no high temperatures. Strong aluminum radiators. What do you mean steel? From the boiler to the pex manifolds? I will not ask you. Describe the installation.

Steel is a panel radiator. The plastic goes to the manifolds is not yet connected to the furnace so 2 meters are missing I do not know if this section of copper to do

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Cauldron for had

Kitten on had and you want to leave pex with him? At least for copper manifolds.

And why can't plastic be? Plumbers do installations, I just lost some confidence in them because they advise me to buy a 35 kW stove and in my opinion too much for 260m2 house very well insulated. These pipes rigid thick plastic water is also such routed

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And the boiler with the feeder can boil water there?

Can be boiled in case of failure.
Congratulations to plumbers.

A small correction is the PP pipe somehow strengthens plumbers say they are suitable

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And aluminum is what good company

I am sorry to say that no plastic pipe is suitable for a solid fuel boiler.
Categorically it must be copper, steel etc.
Due to the possibility of boiling water in the system, it is forbidden to use plastic pipes within the solid fuel boiler.
They can be used, but with gas stoves, etc.
The fact that plumbers say that it is suitable is their business, but in such a case demand from them a written guarantee and a contract for the installation, if something bad happens and these pipes cannot withstand, you will pay for their bunker.
And since you were still advised 35kW on 260m insulated, they really chase these breeders because they do not know what they are doing and in addition probably other flowers of this type will come out during operation and you will be asking again in the forum that something is not working, etc.
As for the size of the boiler, make calculations for:
http://cieplowlasciwie.pl/
And read about boilers etc. on:
http://czysteogrzewanie.pl/
http://czysteogrzewanie.pl/kociol/co-za-duzo-to-niezdrowo-dobor-mocy-kotla-weglowego/
And if you do not want to correct after them, it is best now show what you got there knocks is not too late, because then it will cry.

Such pictures

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This is more or less what it looks like from manifolds, it is well distributed only why they gave this plastic and not copper to manifolds and if there is a 4 way valve at the furnace, can something also happen? I don't know how to work abroad and plumbers I recommend that good specialists had to be well done, they let the pipes out of the manifolds into the basement and there is about 2.5 m to the furnace they haven't done this piece yet because they are waiting for the stove

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I have it all spilled

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And now what to fight with them that they are badly done and they tell me that it is good and that on the Internet they write stupid things because they do so in all homes and they have no complaints. I don't even know if it can be changed now, but I think the walls are not plastered where the pipes go. I do not know myself and how the furnace will be all copper and only on risers plastic for manifolds is also bad
I'd rather not touch it

First of all, you pay, so in my opinion they have nothing to say, since you do not have a boiler room done yet, ask them to do everything in the boiler room on steel / copper around the furnace and only switch to PP, that they say that they write stupidity on the Internet shows about their ignorance and ignorance because I wonder if even one of them finished school in this direction and was able to calculate hydraulic flows and resistances etc. and surely each of them boasts that he has done so much and there were no complaints !!!
And give photos of the boiler room so that they do not cause baboli there, and 4D is not a protection, it only regulates the temperature of heating / return, personally I would not install it, it's a pity, like everyone requires it in the DTR, but this is about protecting the return of the boiler and you can do it differently.
An overview diagram in the attachment

I close the topic thanks a lot for advice